Analysis Tools for Iterative Source-Channel Decoding

We consider the problem of transmitting a correlated Gaussian source over an AWGN channel. This paper contains two main contributions which aid in the design of such a system. We determine the characteristic curves of the source decoder for use in the extrinsic information transfer charts (EXIT charts) and show how the characteristic curves vary with the amount of correlation in the source. Further, we determine contour lines in the EXIT charts showing the signal to noise ratio of the de-quantized signal given that a particular point in the EXIT chart is reached. : Joint source-channel decoding, EXIT charts